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Finding the Fourth Proportional to 20,661.60, 28,513.20 and 11,230.20

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Solution

The fourth proportional to 20,661.60, 28,513.20 and 11,230.20 is: 15,497.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.60 : 28,513.20 = 11,230.20 : x
  2. Step 2: Convert to fraction form
    20,661.60/28,513.20 = 11,230.20/x
  3. Step 3: Cross multiply
    20,661.60x = 28,513.20 × 11,230.20
  4. Step 4: Simplify right side
    20,661.60x = 320,208,938.64
  5. Step 5: Solve for x
    x = 320,208,938.64/20,661.60
  6. Step 6: Final answer
    x = 15,497.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.